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Williams Syndrome (WS) is a neurodevelopmental disorder of known genetic origin, characterized by serious delays in language onset yet relatively verbose, intelligible and fluent speech in late childhood and adulthood. How do motor abilities relate to language in this group? We investigated planning and co-ordination of the movement of the speech articulators (oromotor praxis) in 28 fluent-speaking individuals with WS, aged between 12 and 30 years. Results indicate that, despite their fluent language, oromotor praxis was impaired in WS relative to two groups of typically-developing children, matched on either vocabulary or visuospatial ability. These findings suggest that the ability to plan, co-ordinate and execute complex sensorimotor movements contribute to an explanation of the delay in expressive language early in development in this neurodevelopmental disorder. In the discussion, we turn to more general issues of how individual variation in oromotor praxis may account for differences in speech/language production abilities across developmental language disorders.

Original publication

DOI

10.1016/j.neuropsychologia.2014.11.032

Type

Journal article

Journal

Neuropsychologia

Publication Date

01/2015

Volume

67

Pages

82 - 90

Keywords

Motor ability, Orofacial movements, Sequencing, Speech motor control, Williams syndrome, Adolescent, Adult, Child, Female, Humans, Language Development Disorders, Language Tests, Male, Speech, Verbal Behavior, Williams Syndrome, Young Adult